Wall board



C. S. BIRD WALL BOARD Dec. 18 1923.

Filed May 24 1919 Patented Dec. R8, 1923 UNETED STATES TATZLStZ PATENT @FFHQE CHARLES S. BIRD,

INCORPORATED, CHUSETTS.

OF EAST WALPOLE, MASSACHUSETTS, ASSIGNOB TO BIRD & SON, OF EAST WALPOLE, MASSACHUSETTS, A CORPORATION OF MASSA- WALL BOARD.

- Application filed May 24,

This invention pertains towall boards to and has for its ob ect the production of a substantially rigid and waterproof board which, by reason of its construction and formation, is especially adapted for building purposes, such, for instance, as the construotion of small buildings, garages, and

the like.

The invention has for its further object the production of a board which presents on one side a mineralized surface while the opposite side presents a smooth surface which may be painted or otherwise treated, as desired.

The article which forms the basis of the present invention is illustrated in the annexed drawing, wherein a section of the board is shown in perspective with the variour layers or plies broken away. The board may be said to be composed of. a plurality of plies or layers of so-called felt, three being illustrated and denoted by 1, 2 and 3. These variousbibulous plies or layers are saturated or impregnated with a suitable water resisting material, such, for instance, as asphaltum. The asphaltum is preferably applied in a heated condition and the plies imposed one upon another and subjected to considerable pressure, whereby they are caused to adhere to each other and, in effect, become to all intents and purposes an integral structure. Instead of relying solely upon the impregnating material as a binding agent, the impregnated sheets may have an adhesive coating applied to their surfaces and then subjected to such pressure as will cause their adherence and likewise their consolidation to a greater or less extent or degree. To one side of the body thus formed there is applied a covering of mineral matter 4, such, for instance, as comminuted or crushed stone, which is forced part way into the layer or ply upon which it is imposed, the mineral particles being bound in place by the asphaltum, or by a special layer of adhesive material spread upon the surface of the board. The opposite face of fastened by any 1919. Serial N0. 299,517.

the board is preferably finished by a sheet of paper, denoted by 5, such as heavy manila or so-ca-lled kraft paper. It is caused to adhere to the adjacent face of the board by a layer of waterproofing compound applied to the board, such, for instance, as asphaltum. Such surface is smooth and is intended to be exposed interiorly of the structure which is built up of theboard. Said surface will readil take paint or any other finish which may e applied thereto. The manila or kraft face 5 presents a pleasing interior and may be'left without paint, if so desired. While it is preferred to employ the interior finish sheet 5, particularly where it is to be painted, there are certain uses to which the structure may be put where the sheet may notbe present.

It is possible, of course, to apply a paint finish directly to the inner face of the board in the process of manufacture, which may be all suflicient for the purpose of the user without further treatment, but such facing presents a surface which will take a further coating of paint of any character or tint which the user may desire to employ. It is preferred, however, to produce the structure with the paper facing inasmuch as it strengthens the same and likewise furnishes a finished surface irrespective of any painting.

The mineralized finished surface is de signed as the outer surface of the board and will withstand all weather conditions for a long period of time.

By the employment of the weather proofing compound between the paper and the felt, moisture is prevented from getting into the felt even though it passes through the paper, and thus dampness is excluded and consequent warping of the board due to dampness is prevented. The board may be cut up into the desired shape or size and suitable means upon the framing or studding, and will be found sufficiently stable to admit of its use in the building of garages and cheap portable houses.

What is claimed is,--

1. As a new article of manufacture, a building board substantially rigid under varying atmospheric conditions, comprising a plurality of plies of felt saturated with'asphaltum and imposed one upon the other in adherent relation; a surface of mineral partieles {iroduved upon one face of the bod thus fi'n'niod; and ii sheet of paper secured upon the opposite me by :i Waterproof cement.

:2. A composite building hoard consisting; of a plurality of relatively thick sheets of bibulous ulp stock, each thoroughly sutumted with a, bitun'iinous, moistureresistive compound, and mid sheets subsequently cemented together with the same kind of compound under )ressure and thereby unified into a thick, rigid, substantially integral building board.

3. A rigid composite building board consisting of a, plurality of relatively thick sheets of hibulous pulp stock; each thoroughly saturated Willi a bituminous, moisture-resislive compound and said sheets together with am facing decoratiw Sheet cemenied together by interspersed layers therebetweeu of the same kind of compound, under pressure whereby to form :1 unified, substantially integral structure.

In lestimony whereof l have signed m name to this specification.

GHAELES S. 

